General and Specific Combining Aability In Maize by Using ( Liner x Tester ) Analysis

	General and Specific Combining Aability In Maize by Using ( Liner x Tester ) Analysis
journal of al-qadisiyah for pure science(quarterly)
Article 1, Volume 7, Issue 1, 2007, Pages 13-24 PDF (0 K)
Abstract
A field experiment was carried out at the field crop research station of IPA – Agricultural research center during two seasons ( spring and autumn ) 2002 . In spring eight lines were crossed by three testers in a line x tester method to produce twenty four F1 hybrids . In autumn season the parents and crosses seeds were grown in a randomized complete block design with three replications to evaluate their traits and to estimate the general combining ability for lines and testers and specific combining ability for hybrids in yield and yield components . Results showed significant differences among the different genotypes for the yield and yield components , except number of ears per plant . There were significant differences on the effect of general combining in all inbred lines of maize and it appears that highest positive effect for number of grains per ear was 94.41 grain for inbred line ( OH40 ) , and the inbred line W13R was the best for 1000 kernels weight ( 22.70 ) gm . While the inbred line ( HS ) was the best in grain yield per plant ( 20.15 ) gm . The hybrid ( DK798 × R153 ) gave the heighest positive effect SCA for number of grains per ear ( 116.47 ) grain and for grains yield per plant ( 29.98 ) gm . While the hybrid ( OH40 × SC2052 ) gave the heighest effect for specific combining ability for 1000 kernels weight ( 37.10 ) gm .

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